Click the print link to print the sizing chart below...make sure the chart has printed to scale. Then cut out the box that comes closest to matching the part of your LCD screen that lights up. You can then order the hood model number of the box that fits your screen. If you do not want to go through the trouble of printing and cutting... just check out the measurements of each box and order the hood with the measurements that come closest to matching the measurements of the part of your screen that lights up.